1. Collaborate with somebody. You can use the forums to find people.
2. Your game has to be a "response" to another game, whatever that means. You can use the forums to find those, too.
3. Make sure anybody who asks can get your game for free. If you can and want, make your game PWYW.
4. Don't write hateful bullshit, use content warnings, et cetera. The basics.

Submit as many entries as you want, but collaborate with a different person each time.